基于小波变换的搭板病害检测方法试验研究

针对高速公路桥梁搭板出现脱空病害后难以检测的问题,通过搭板实体模型试验,利用地质雷达进行检测,采用小波变换方法对信号处理分析,降低噪声,提高信噪比,为该病害处理提供借鉴经验。     

解析船舶安全航行的桥楼航行值班报警系统

桥楼航行值班报警系统(BNWAS)旨在通过安全监视功能来监视驾驶室值班员的活动,当值班驾驶员(OOW)失去履行其职责的能力而发出警报时,以尽可能避免与驾驶台操作有关的海上事故[1-2]。该系统对海上船舶的安全航行尤为重要,但仍存在某些不足。通过对该系统组成、功能和原理的分析,提出使用中的一些疑惑和自己的理解及建议,为提高船舶安全航行提供参考。     

内河数字化航标系统设计及应用

由于内河运输的不断发展,使得对航标的数字化要求越来越高。然而,目前内河航标数字化程度较低,不能够满足安全航行的要求。文中从软硬件2个方面提出了一种内河数字化航标系统方案,并且通过对目前内河使用航标进行数字化改造来论证此方案,此外,还介绍了一种内河航标灯质识别算法。     

国际型海员思政教育浅议

海上事故的发生与海员素质紧密相关,为了减少事故发生,提高海员工作效率,必须提高海员素质。通过分析海员面临的一些生活与工作中的问题,提出当前海员劳务输出中存在的症结,由此归纳出海员应当具备的十二类方面的综合素质能力,并针对这些要求,提出国际海员思想政治教育在理论与实践方面改进的建议。     

影响操船能力因素的指标化

航行环境、船舶和操船者三个要素构成了船舶运航系统。航行环境由交通环境和自然环境组成。本文在阐述了影响操船能力致因后,分析了各因素对操船能力的影响,并将该影响指标化。这些定量化的指标表达了操船者的主观操船感觉,以便进一步综合评价航行环境     

电子地图轨道地理坐标描述方法研究

卫星定位在列控系统中应用时,需要使用能够描述轨道地理坐标信息的电子地图文件.首先对弯轨的两种描述方法进行优缺点分析,提出线段近似法更有利于工程应用和实施,然后对使用线段近似点进行弯轨近似描述的误差进行量化分析,提出基于最大误差的近似点间隔确定方法,该方法既可以保证轨道描述精度又能有效降低电子地图数据量.     

A GPS-based system for precise shipping guidance and control

This paper discusses the general concept of an automatic berthing system. The research considered the automatic berthing of a large merchant ship. A global positioning system (GPS)-based system, which provides the necessary information on position, velocity, attitude (roll, pitch, and heading), angular velocity, and time, was the principal sensor used. Field tests were conducted on board a hydrographic sounding ship to assess the quality of information obtained from a GPS-based system. The data were processed using the software with which the algorithms developed in this research were implemented. This paper also discusses various aspects concerning a real-time GPS-based system in relation to an automatic berthing system, such as integration of sensors, mathematical models, port infrastructure, and training of crews. Received: October 22, 1999 / Accepted: June 30, 2000     

Optimum routing of a sailing wind farm

To acquire the wind energy of the oceans, a sailing wind farm has been proposed. The wind farm considered is composed of a semisubmersible floating structure, 11 windmills, four sails, six thrusters, and storage for hydrogen. To maximize the acquired energy, an effective algorithm to search for optimum routes was developed. The algorithm is based on the fact that beam winds yield a maximum of acquired energy. This feature reduces the computation time, and, consequently, efficient route optimization becomes possible in a reasonable time. After setting an operational area for the wind farm, navigation simulations for a 1-year period were carried out. A numerical weather forecast was used as well as the responses of the floating structure, such as the speed of the structure, the output power of the windmills, and the time of course changes. In the simulation, the wind farm evades rough seas to avoid structural damage, and an optimum route is searched for. The capacity factor of the system was used to evaluate the efficiency of the optimized routes. From the simulations, the maximum capacity factor achieved was 42.6%. The dependency of the capacity factor on the initial position of the wind farm was also examined. It was shown that offshore from Sanriku in northeastern Japan is an area suited to the operation of the wind farm. The effect of the initial position on consecutive periods of operation is discussed.     

AIS应用在航标中存在的问题及建议

运用高新技术增进海上交通运输安全,为航海人员提供更好的航标服务是航海科技工作者的目标。将船舶自动识别系统(AIS)应用于航标有其独特的优点,有效地改善了航标的助航效果。此文在介绍AIS航标的分类、特点、局限性和对航行船舶的导航作用的基础上,提出AIS应用在航标中尚存在的问题和在使用、设置上的建议。     

基于北斗救援和ISPS规则的船舶人员安保管理系统研究

研究了基于北斗短报文通信方式的船用ISPS人员管理及救援管理的系统,具体包含天地海北斗卫星网络、船舶通信网络、低功耗高可靠性的BDS北斗通信基站,提出了基于模糊集合和贝叶斯的多对多Super-Bluetooth算法,设计了手环检索和定位的BR通信基站方案,提升和实现了基于北斗救援的ISPS人员管理。